I have a GSO laser collimator that I don't use anymore as I've got others now to work with. That's the one (http://reviews.agenaastro.com/product-reviews/Parts-and-Accessories/Collimation-and-Focusing/GSO/p/PALC__GS__NLA-GSO-1-25-Newtonian-Deluxe-Laser-Collimator-II.html).